Highly Ordered Nanoporous β-Ni(OH)2 Nanobelt Array Architectures as Electrode Material for Electrochemical Capacitors: Design, Synthesis, Characterization and Supercapacitive Evaluation

Abstract

The electrochemical performances derived from the supercapacitors extremely depend on their morphology. So, designing nanostructured electrode materials has a dramatic role in supercapacitors. Herein, highly ordered nanoporous Ni(OH)2 nanobelt arrays (HONNA) were synthesized via a mild wet-chemical route. Ammonia and persulfate concentrations played an important role in the formation of the nanobelt array architecture. The as-prepared nanobelt arrays were characterized using FE-SEM, FT-IR, XRD, and EDX analysis. The resultant Ni(OH)2 nanobelt electrode revealed a specific capacitance of 384 mF cm 2 at 1.0 mA cm 2, fast rate performance, and excellent cycle life. These notable electrochemical features were related to the morphology of highly ordered nanoporous nanobelt array architectures, which provides numerous free channels and offers more electroactive sites and sufficient buffering space to moderate inner mechanical stress and minimize the ion transfer path during the redox reactions. These highly ordered nanoporous Ni(OH)2 nanobelt arrays were suitable candidates as electrode material in supercapacitors.

Keywords

• highly ordered nanoporous β -ni(oh)2
• nanobelt arrays
• supercapacitor
• wet chemical route